ELECTRICITY STORAGE SYSTEM AND MANAGEMENT DEVICE

A managing unit () calculates a whole state of power (SOP) that is an SOP of a whole of the plurality of power storage blocks ( to ) based on SOPs of the respective power storage blocks ( to ) and currents flowing through the respective power storage blocks ( to ), and sets an upper limit value of power or a current for at least one of charging and discharging by a power converter (), based on the whole SOP thus calculated. The managing unit () estimates a current flowing through each of the power storage blocks ( to ) from a voltage and an internal resistances of each of the power storage blocks ( to ) before the power converter () starts power conversion.